I am a frame builder AMA

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benana in reply to @Biggles567

What is the reason for not putting in the butt transition zone?

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Biggles567 in reply to @benana

The thinner section in the middle flexes more than the heavier gauge ends, works to distribute stresses over the tube/away from the welds.

The transition zone can be a focus of those stresses afaik.

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benana in reply to @Biggles567

I can see that makes sense.

Just measured my last frame and I have banged my holes right in the transition 😬

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